docs(18-05): complete models route tests plan

Tasks completed: 2/2 (combined)
- Create models route tests for basic functionality
- Add models route tests for caching and error handling

SUMMARY: .planning/phases/18-api-route-tests/18-05-SUMMARY.md

.planning/ROADMAP.md

@@ -240,7 +240,7 @@ Plans:
 - [x] 18-02: LLM route (Google, OpenAI providers)
 - [x] 18-03: Generate route (Gemini provider)
 - [x] 18-04: Generate route (Replicate, fal.ai providers)
-- [ ] 18-05: Models route (caching, aggregation)
+- [x] 18-05: Models route (caching, aggregation)
 
 #### Phase 19: Type Refactoring
 
@@ -319,7 +319,7 @@ Phases execute in numeric order: 1 → 2 → ... → 14 → 15 → 16 → 17 →
 | 15. Test Infrastructure | v1.2 | 1/1 | Complete | 2026-01-12 |
 | 16. Store Modularization | v1.2 | 1/1 | Complete | 2026-01-12 |
 | 17. Component Tests | v1.2 | 11/11 | Complete | 2026-01-13 |
-| 18. API Route Tests | v1.2 | 4/5 | In progress | - |
+| 18. API Route Tests | v1.2 | 5/5 | Complete | 2026-01-13 |
 | 19. Type Refactoring | v1.2 | 0/? | Not started | - |
 | 20. Integration Tests | v1.2 | 0/? | Not started | - |
 | 21. Fix Image Input & Deduplication | v1.2 | 0/? | Not started | - |

.planning/STATE.md

@@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-01-09)
 ## Current Position
 
 Phase: 18 of 22 (API Route Tests)
-Plan: 4 of 5 in current phase
+Plan: 5 of 5 in current phase
-Status: In progress
+Status: Phase complete
-Last activity: 2026-01-13 - Completed 18-04-PLAN.md
+Last activity: 2026-01-13 - Completed 18-05-PLAN.md
 
-Progress: █████████░ 92%
+Progress: █████████░ 93%
 
 ## Performance Metrics
 
@@ -128,6 +128,6 @@ Recent decisions affecting current work:
 ## Session Continuity
 
 Last session: 2026-01-13
-Stopped at: Completed 18-04-PLAN.md (Generate route Replicate/fal.ai tests)
+Stopped at: Completed 18-05-PLAN.md (Models route tests) - Phase 18 complete
 Resume file: None
-Next action: Execute Plan 18-05 (run /gsd:execute-plan .planning/phases/18-api-route-tests/18-05-PLAN.md)
+Next action: Plan Phase 19 (run /gsd:plan-phase 19)

.planning/phases/18-api-route-tests/18-05-SUMMARY.md

@@ -0,0 +1,105 @@
+---
+phase: 18-api-route-tests
+plan: 05
+subsystem: api
+tags: [models, caching, replicate, fal.ai, testing, vitest]
+
+# Dependency graph
+requires:
+  - phase: 18-api-route-tests (18-04)
+    provides: Provider test patterns and fetch mocking
+provides:
+  - Complete models route test coverage
+  - Cache behavior tests
+  - Provider aggregation tests
+affects: [19-type-refactoring, 20-integration-tests]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [URL-based fetch mock routing for multi-provider tests]
+
+key-files:
+  created: [src/app/api/models/__tests__/route.test.ts]
+  modified: []
+
+key-decisions:
+  - "Combined tasks into single commit since all tests target same file"
+  - "Used URL-based mock routing instead of sequential mocks for multi-provider calls"
+
+patterns-established:
+  - "Cache module mocking pattern for models route tests"
+  - "Multi-provider fetch mocking with URL-based routing"
+
+issues-created: []
+
+# Metrics
+duration: 5min
+completed: 2026-01-13
+---
+
+# Phase 18 Plan 05: Models Route Tests Summary
+
+**Complete models route test coverage with caching, provider aggregation, capability inference, and pagination**
+
+## Performance
+
+- **Duration:** 5 min
+- **Started:** 2026-01-13T02:49:01Z
+- **Completed:** 2026-01-13T02:54:22Z
+- **Tasks:** 2 (combined)
+- **Files created:** 1
+
+## Accomplishments
+
+- Created 22 tests for /api/models route covering all functionality
+- Tested cache hit/miss/refresh behavior with mocked cache module
+- Tested Replicate capability inference from model name/description keywords
+- Tested fal.ai category mapping to ModelCapability
+- Tested pagination (max 15 pages), sorting, and error handling
+
+## Task Commits
+
+Tasks were combined into a single commit since all tests target the same file:
+
+1. **Task 1+2: Add models route tests for caching and provider aggregation** - `cd9135c` (test)
+
+**Plan metadata:** (pending this commit)
+
+## Files Created/Modified
+
+- `src/app/api/models/__tests__/route.test.ts` - Created comprehensive test suite (22 tests)
+
+## Decisions Made
+
+- Combined tasks into single commit since logically grouped in one file
+- Used URL-based fetch mock routing to handle both providers being called in same request
+
+## Deviations from Plan
+
+### Task Consolidation
+
+**1. [Rule 5 - Enhancement] Combined Task 1 and Task 2**
+- **Found during:** Task 1 (basic functionality tests)
+- **Issue:** Both tasks target same file with logically grouped tests
+- **Decision:** Combined into single comprehensive commit rather than artificial split
+- **Impact:** Single commit instead of two, cleaner git history
+
+---
+
+**Total deviations:** 1 (task consolidation for cleaner commits)
+**Impact on plan:** No scope change, all tests implemented as specified
+
+## Issues Encountered
+
+None
+
+## Next Phase Readiness
+
+- Phase 18: API Route Tests complete (5/5 plans)
+- All API routes now have test coverage
+- Ready for Phase 19: Type Refactoring
+
+---
+*Phase: 18-api-route-tests*
+*Completed: 2026-01-13*